LONDON (AP) Australian Open champion Angelique Kerber advanced to the Wimbledon quarterfinals for the second time in three years Monday, beating Misaki Doi 6-3, 6-1 at the start of the busiest day in Grand Slam tennis.
The fourth-seeded German needed just over an hour to defeat the 49th-ranked Doi, who was the first Japanese woman to reach the fourth round of a major tournament in 10 years.
It was the first match between the two lefthanders since January's Australian Open, where Kerber saved a match point before beating Doi in three sets in the first round. Kerber went on to beat Serena Williams in the final for her first Grand Slam title.
On Monday, Kerber broke Doi four times and never faced a break point. She also had only nine unforced errors, compared to 20 for Doi.
Kerber, who reached the semifinals at the All England Club in 2012 and the quarterfinals in 2014, will next play either Simona Halep or Madison Keys.
Also advancing in early play Monday was No. 21 Anastasia Pavlyuchenkova of Russia, who reached her first quarterfinal at Wimbledon by beating 27th-seeded CoCo Vandeweghe 6-3, 6-3.
Pavlyuchenkova had only seven unforced errors, 15 fewer than Vandeweghe, and broke the American five times. Vandeweghe, a 2015 quarterfinalist at the All England Club, had lost serve only twice in the first three rounds this year.
''A lot of things weren't working,'' Vandeweghe said. ''Missing easy first balls. ... The fact I was getting pushed around out there - that's me not doing my job.''
Seeking to reach her first major semifinal, Pavlyuchenkova will play either No. 1 Serena Williams or No. 13 Svetlana Kuznetsova next.
Monday's schedule featured all 16 men's and women's fourth-round matches.
After rain delays forced organizers to schedule matches on the middle Sunday for only the fourth time in history, the tournament is back on track going into the second week.
Seven-time men's champion Roger Federer was up first on Centre Court, facing 29th-ranked Steve Johnson.
Six-time women's winner Serena Williams is paired against Svetlana Kuznetsova in the next match on Centre Court, followed by No. 2 Andy Murray against Nick Kyrgios.
Missing from the schedule is No. 1 Novak Djokovic, whose 30-match Grand Slam-winning streak was snapped by Sam Querrey in the third round on Saturday.